In a word, YES.
Are your chickens awake all night drinking water?
Mine either. You may still have liquid water in the source container when the temps drop because it is a larger volume. You may even have liquid water in the center of the pipe. The water closest to the outside of the pipe, and that includes the nipples (
especially the nipples), will freeze first. If the warm water isn't flowing through the pipe, moving the colder water back into the source, you will get frozen nipples
and NO ONE wants that!
The system in the 3rd video (the only one I watched) is very similar to mine. There are 2 major differences:
1) Mine is an insulated 5 gallon Igloo drink cooler, outside the coop sitting on a shelf about 18" above the feed pipe (3/4" with saddle nipples). I do not have a problem with them leaking so if the 1.5" pipe he is using is needed to provide enough pressure to keep them from leaking with the bottom of the source being the same height as the nipple pipe, the 18"+ head of my bucket is doing the same for a 3/4" pipe. My return is 3/8" ID clear tubing.
2) I have the water flowing from or near the bottom of the container. He has a point about not having to put pipe into the side or bottom of the source. I'm still messing with keeping them from leaking (using old non insulated bucket at the moment). However, his system requires the pump run 365 days a year or the birds will run out of water. The only way to not run the pump all day, every day, is to revert to his free standing waterers in non freezing periods. I'm not willing to spend electricity 6 or 7 months of the year when Mother Nature can push it through in a free, non polluting way.